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Superelastic, Sensitive, and Low Hysteresis Flexible Strain Sensor Based on Wave-Patterned Liquid Metal for Human Activity Monitoring
Abstract
Flexible strain sensors have been widely used in wearable electronic devices for body physical parameter capturing. However, regardless of the stretchability of the sensing material, the resolution of small strain changes or the hysteresis between loading/unloading states has always limited the various applications of these sensors. In this paper, a microfluidic flexible strain sensor was achieved by introducing liquid metal eutectic gallium indium (EGaIn) embedded into a wave-shaped microchannel elastomeric matrix (300 μm width × 70 μm height). The microfluidic sensor can withstand a strain of up to 320%, and the hysteresis performance was also improved from 6.79 to 1.02% by the wave-patterned structure which can restrain the viscoelasticity of the elastomer effectively. Moreover, an enhanced wave-shaped strain sensor was fabricated by increasing the length of the microfluidic channel; it has high sensitivity (GF = 4.91) and resolution, and even as low as 0.09% strain change could be detected, which is capable of resolving microdeformation; besides, the enhanced wave-shaped strain sensor exhibits quick response time ( t = 116 ms), long-term stability, and durability under periodic dynamic load. As an example of potential applications, the enhanced flexible sensor showed excellent mechanical compliance and was successfully applied as a conceptual wearable device for distinctively monitoring various kinds of human body and robot activities, such as the different states of the finger, neck, breathing chest, robot’s joint, and so forth. The flexible wave-shaped strain sensor has great promising applications for wearable electronics, motion recognition, healthcare, and soft robotics.
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Cited by
Su, Y., Ma, C., Chen, J., Wu, H., Luo, W., Peng, Y., Luo, Z., Li, L., Tan, Y., Omisore, O. M., et al. (2020) · Nanoscale Research Letters · doi:10.1186/s11671-020-03428-4 · Cited by 287
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Metadata
- Authors
- Chen, J., Zhang, J., Luo, Z., Zhang, J., Li, L., Su, Y., Gao, X., Li, Y., Tang, W., Cao, C., Liu, Q., Wang, L., & Li, H.
- Venue
- ACS Applied Materials & Interfaces
- Publisher
- American Chemical Society (ACS)
- Published
- 2020-04-21
- Volume
- 12
- Issue
- 19
- Pages
- 22200-22211
- ISSN
- 1944-8244 (ISSN-L)
- 1944-8252
- OpenAlex
- W3016448747
- Cited by
- 282
- References
- 60
- FWCI
- 10.98
- Type
- journal article
- Language
- en
- Open access
- closed
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